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61. ★★ Two thin lenses have optical powers of 4.0 D and
5.0 D, respectively. They are 0.90 m from each other.
(a) Find the focal length of the lenses.
(b)
(c)
Find the location of the image of an object that is
0.50 m in front of the first lens.
Can you use the equation for the combined power
of the lenses to solve this problem? Justify your
answer.

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